<template>
  <div id="home">
    <nav-bar  class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl1" class="tab-control" v-show="isTabFixed"/>
    <scroll @pullingUp="loadMore" :pull-up-load='true' @scroll="contentScroll" :probeType="3" ref="scroll" class="content"  >
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"> </home-swiper>
      <recommend-view :recommends="recommends"/>
      <feature-view/>
      <tab-control :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl2" />
      <goods-list :goods='goods[currentType].list'/>
    </scroll>

    <back-top @click.native="backClick" v-show="isShowBackTop"> </back-top>
    <!--组件绑定事件需要加上.native-->
  </div>
</template>

<script>
  import NavBar from "components/common/navbar/NavBar";
  import TabControl from "components/content/tabControl/TabControl";
  import GoodsList from "components/content/goods/GoodsList";
  import Scroll from "components/common/scroll/Scroll";

  import HomeSwiper from "./childComps/HomeSwiper";
  import RecommendView from "./childComps/RecommendView";
  import FeatureView from "./childComps/FeatureView";

  import {getHomeMultidata, getHomeGoods} from "network/home";
  import {itemListenerMixin, backTopMixin} from "common/mixin";


  export default {
    name: "Home",
    components: {
      Scroll,
      HomeSwiper,
      FeatureView,
      RecommendView,
      NavBar,
      TabControl,
      GoodsList
    },
    mixins:  [itemListenerMixin,backTopMixin],
    data(){
      return {
        banners: [],
        recommends: [],
        goods: {
          'pop' : {page: 0, list: []},
          'new' : {page: 0, list: []},
          'sell' : {page: 0, list: []},
        },
        currentType : 'pop',
        tabOffsetTop: 0,
        isTabFixed: false,
        saveY : 0
      }
    },
    created() {
      this.getHomeMultidata();
      this.getHomeGoods('pop');
      this.getHomeGoods('new');
      this.getHomeGoods('sell');

      console.log("重新创建")
    },
    mounted() {
    },
    methods: {
      /*
      * 事件监听相关方法
      * */
      tabClick(index){
        switch (index) {
          case 0:
            this.currentType = 'pop';
            break;
          case 1:
            this.currentType = 'new';
            break;
          case 2:
            this.currentType = 'sell';
        }
        this.$refs.tabControl1.currentIndex = index;
        this.$refs.tabControl2.currentIndex = index
      },
      contentScroll(position) {
        // 1.判断BackTop是否显示
        this.isShowBackTop = position.y < -1000;
        //2.决定tabControl是否吸顶
        this.isTabFixed = (-position.y) >= this.tabOffsetTop
      },
      loadMore() {
        this.getHomeGoods(this.currentType);
        this.$refs.scroll.finisPullUp();

      },
      swiperImageLoad() {
        this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
      },

      /**
       * 网络请求相关方法
       * */
      getHomeGoods(type) {
        const page = this.goods[type].page+=1;
        getHomeGoods(type, page).then(res => {
          this.goods[type].list.push(...res.data.list)
          /*把res.data.list这个对象数组里面的所有对象取出放入this.goods[type].list这个数组里面*/
        })
      },
      getHomeMultidata() {
        getHomeMultidata().then(res => {
          this.banners = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        })
      }
    },
    computed: {

    },
    activated() {
      this.$refs.scroll.scrollTo(0,this.saveY,0);
      this.$refs.scroll.refresh()/*建议刷新一下滚动高度*/
    },
    deactivated() {
      this.saveY = this.$refs.scroll.getScrollY();
      // this.$bus.$off('itemImgLoad',this.itemImgListener)
    },
  }
</script>

<style scoped>
  #home {
    /*padding-top: 44px;*/
    position: relative;
    /*height: 100vh;!*百分之百的视口高度*!*/
  }
  .home-nav {
    background-color: var(--color-tint);
    color: white;
    position: relative;
    z-index: 9;

    /*在使用浏览器元素滚动时使用*/
    /*position: fixed;*/
    /*left: 0;*/
    /*right: 0;*/
    /*top: 0;*/
    /*z-index: 9;*/
  }

  .content{

    position: absolute;
    top: 44px;
    bottom: 49px;
    height: calc(100vh - 93px);/**/
  }

  .tab-control {
    position: relative;
    z-index: 9;
    margin-bottom: 8px;
  }
  /*.content{*/
  /*  height: calc(100% - 93px);!**!*/
  /*  overflow: hidden;*/
  /*  margin-top: 44px;*/
  /*}*/


</style>
